Assessment of regional landslide susceptibility based on fractal theory and information amount method of GIS

doi:10.16265/j.cnki.issn1003-3033.2025.01.0480

Abstract

Abstract:

In order to reduce the losses caused by landslide disasters, taking Changde city of Hunan province as an example, the fractal theory and information method were applied to evaluate the regional landslide susceptibility based on field investigation and historical landslide data. The sensitivity of influence factors was quantitatively studied by fractal theory. The information values of each secondary impact factor were obtained by using the information method, and the comprehensive information values were obtained by combining the fractal dimension value and the information value. Based on the values, the susceptibility zoning of the study area was carried out. The results show that the slope, engineering geological rock group, elevation and vegetation are the influencing factors that have a second-order cumulative and fractal distribution with the landslide, while other influencing factors have a first-order cumulative and fractal distribution with the landslide. The areas of very low, low, medium, high and very high susceptibility areas respectively account for 5.24%, 8.84%, 35.06%, 39.21% and 11.65% respectively. Annual rainfall greater than 1 600 mm, slope of 20-30° and elevation of 900-1100m are important factors.

Key words: geographic information system (GIS), information amount method, assessment of regional landslide susceptibility, fractal theory, geological hazard

CLC Number:

X915.5

CAO Hongyang, REN Xiaoying, LI Zhiqiang. Assessment of regional landslide susceptibility based on fractal theory and information amount method of GIS[J]. China Safety Science Journal, 2025, 35(1): 178-185.

Figures/Tables 10

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坡度/ (°)	区间划分	坡度段编号r'	滑坡分布面积N'/km²
	[10,20)	1	2.771
	[20,30)	2	2.034
	[0,10)	3	1.303
	[30,40)	4	0.724
	[40,60)	5	0.205
	[60,90)	6	0.005

评价指标	划分区间	r'	N'/km²	分维值	评价指标	划分区间	r'	N'/km²	分维值
坡向/(°)	[90,135)	1	1.69	0.689	断层缓冲距离/m	≥2 000	1	4.936	0.253
	[315,360)	2	1.231			[0,500)	2	0.915
	[135,180)	3	1.051			[500,1 000)	3	0.602
	[270,315)	4	0.82			[1 000,2 000)	4	0.581
	[225,270)	5	0.683		河流缓冲距离/m	[0,200)	1	2.238	0.649
	[0,45)	6	0.607			[200-400)	2	1.583
	[45,90)	7	0.591			≥1 000	3	1.376
	[180,225)	8	0.417			[400,600)	4	0.827
高程/m	[100,300)	1	2.602	1.383		[600,800)	5	0.604
	[700,900)	2	1.207			[800,1 000)	6	0.404
	[300,500)	3	1.177		年均降雨量/mm	[1 200,1 300)	1	2.223	0.847
	[900,1 100)	4	0.916			[1 300,1 600)	2	2.204
	[500,700)	5	0.749			>1 600	3	1.647
	[1 100,1 300)	6	0.328			[1 000,1 200)	4	0.97
	[0,100)	7	0.061		NDVI	[0.40,0.49)	1	2.577	1.478
	[1 300,1 500)	8	0.003			[0.49,0.68)	2	1.871
岩组类型	碎屑岩类	1	5.024	1.193		[0.29,0.40)	3	1.844
	碳酸盐岩类	2	1.991			[0.11,0.29)	4	0.635
	松散堆积岩类	3	0.041			<0.11	5	0.09
	浅变质岩类	4	0.003		与道路距离/m	省道100、县道50外	1	6.938	0.011
断层缓冲距离/m	≥2000	1	4.936	0.253		县道50	2	0.053
	[0,500)	2	0.915			县道25	3	0.043
	[500,1 000)	3	0.602			省道100	4	0.014
	[1 000,2 000)	4	0.581			省道50	5	0.009

评价指标	分类	综合信息量值	评价指标	分类	综合信息量值
高程/m	[0,100)	-3.518 33	岩组	浅变质岩类	-3.978 57
	[100,300)	0.489 64		碳酸盐岩类	-0.474 93
	[300,500)	-0.373 60		碎屑岩类	0.385 92
	[500,700)	-0.701 92		松散堆积岩类	-2.679 14
	[700,900)	0.776 53	断层缓冲区/m	[0,500)	0.156 04
	[900,1 100)	1.050 29		[500,1 000)	0.050 35
	[1 100,1 300)	0.086 81		[1 000,2 000)	-0.113 36
	[1 300,1 500)	-5.419 56		[2 000,4 000]	-0.010 10
	[1 500,2 100]	—	水系缓冲区/m	[0,200)	0.086 02
坡度/(°)	[0,10)	-0.875 19		[200,400)	0.049 36
	[10,20)	0.340 89		[400,600)	-0.183 78
	[20,30)	0.424 54		[600,1 000]	-0.032 67
	[30,40)	0.070 33	年均降雨量/mm	[1 600,5 000]	1.663 92
	[40,60)	-0.250 26		[1 300,1 600)	-0.087 18
	[60,90]	-0.203 21		[1 000,1 300)	-0.265 81
坡向	平面	-0.405 81	NDVI	[-0.3,0.11)	-0.757 01
	北	0.046 59		[0.11,0.29)	-0.166 04
	东北	-0.271 84		[0.29,0.40)	0.313 35
	东南	0.164 58		[0.40,0.49)	0.218 74
	南	0.283 96		[0.49,0.68]	-0.393 69
	东	-0.372 15	路/m	县道25	-0.001 42
	西	-0.500 52		县道50	0.000 88
	西北	0.059 51		省道50	-0.013 50
	西南	0.187 85		省道100	-0.008 26
	西南	0.187 85		省道、县道外	0.000 06

分区	极低危险区	低危险区	中危险区	高危险区	极高危险区
信息量值	[-11.774,5.912 6]	(5.912 6,2.952 2]	(2.952 2,0.820 7]	(0.820 7,0.422 7]	(0.422 7,3.323 9]
滑坡面积/km²	0.001 4	0.029 4	0.552 3	3.819 7	2.648 0
面积比/%	5.24	8.84	35.06	39.21	11.65
特征	地形起伏小,构造较简单,区内年均降雨量低,人类工程活动一般	地形坡度较小,构造较简单,岩体风化中等,人类工程活动一般	地形坡度较陡,冲沟较发育,泥质砂岩和页岩风化较强烈	地势陡,海拔高,受断裂构造影响较大	岩体风化严重,构造复杂,地形较陡